The fifth Invincible of the Royal Navy was a battlecruiser, the lead ship of her class of three, and the first ship of her type to be built in the world.

The ship was built at Sir W. G. Armstrong, Whitworth & Co., Ltd on Tyneside. She was laid down in April 1906, and launched a year later on 13 April 1907, before being commissioned into the fleet on March 20th 1908

• Length: 171m
• Beam: 23.9 m
• Draught: 8.2 m
• Displacement: 17,526 tonnes
• Crew: 784 (up to 1000 in wartime)
• Power: 4 Parsons steam turbines producing 41,000 shp
• Speed: Up to 28 knots (52 km/h)

The ship's primary armament consisted of eight 12in guns in four twin turrets, with, in addition, sixteen 4in guns also fitted.

Invincible initially served with the 1st Cruiser Squadron until 1913, when she was assigned to the 1st Battlecruiser Squadron. At the beginning of the First World War, she took part in the action at Heligoland Bight, before being sent along with her sister Inflexible to the South Atlantic where she fought in the Battle of the Falkland Islands.

At the battle of Jutland on 31 May 1916, she was the flagship of the 1st Battlecruiser Squadron. She was hit in her "Q" turret by a salvo from Lützow and blew up, breaking in two and sinking with the loss of all but six of her crew of 1,026. Admiral Hood was among the dead.